Hello all,

I finally have another option to purchase another Volvo, however, this one has a potential issue id like some clarification on.

The Volvo is a 93 940 2.3 NA with the Regina Ignition and Fuel system. It has 256k miles.

The issue with the vehicle is that there is no power when you accelerate. It falls flat on its face if you 'stomp' on the accelerator pedal.

The only codes on the vehicle are for the o2 sensor. (after jumping pin 2 and pin 6).

After checking the fuel pressure at the schrader valve on the fuel rail with the engine running, i am only getting 28 PSI. If i 'goose' the throttle, the pressure will drop slightly on the gauge. Also removing the vacuum hose from the FPR, the PSI only raises by 1 PSI.

I also checked fuel pressure at the schrader valve before the fuel filter and my readings were the same.

Also i did crimp off the return line after the FPR and again, no change in fuel pressure.

What i am confused about is what is the correct fuel system pressure?

I was under the assumption it was 43.5 PSI engine idling?. Other places i have found online state between 28 and 44 PSI.

So i can i safely assume the pump is the culprit IF the system pressure is supposed to be 43.5 PSI? I would also like to assume the fuel pressure on this regina fuel system should increase as the throttle is opened?

I have 20" vacuum, 155 PSI on all cylinders after a compression test, the Volvo has a new timing belt, fuel filter and all new ignition wires and plugs (denso).

The only 2 tests i did not do are a fuel pump amp test as well as a voltage drop test on the feed and ground side of the fuel pump.

Thanks for any feed back guys and gals!

The 28psi says the pump needs to be replaced. Idling pressure should be about 34.5psi, rising to 44.5psi at wide open throttle acceleration.

IMO, the rest of your excellent analysis confirms this.


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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Thanks for the response Lucid. And im glad the diagnostic routine was right. I actually sent you an email as i was referred to you by a TB member as he said your the guru of the regina systems.

Do you have any preference on pumps? I was going to buy the one from FCP Grotton?

"Do you have any preference on pumps? I was going to buy the one from FCP Grotton?"

For a job like that I went with OE for my preemptive pump swap at 154K in '06 (doing fine now at 187k). But Art Benstein put in an FCP aftermarket pump just before I did mine, and I believe it's still good 6 years later.

Art did his usual excellent photo essay on his pump replacement (his first, outdoors on windy 40° day). You can find it HERE on his website. Well worth studying.


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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

That was a great link, Lucid. I really appreciate your help and expertise.

Ill probably order the pump from FCP as it does supposedly come with a life time warranty.

The Volvo will be my daily driver to work and back and even though its high mileage, i only have a 1 mile commute so it will fit the bill perfectly.